For fleets, support ranges (0.., 1..10, 1.., etc) in addition to a fixed number of nodes

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This issue is stale because it has been open for 30 days with no activity.

Fleets already support nodes ranges, e.g. it's possible to create empty fleets:

type: fleet
name: cloud-fleet
placement: cluster
nodes: 0..4

There are some issues that need to be addressed to make elastic fleets useful:

Do not autodelete empty fleets (for now only if they allow 0 nodes).
Respect nodes upper bound.
Respect fleet configuration when run apply adds new instances to fleet (e.g. merge run and fleet configurations).
Allow run apply to provision nodes to fleets with zero nodes. Currently, a run uses an existing fleet only if it can reuse some of its instances.

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